Everyone with oil temp issues

chubbs · 04-02-2009, 11:31 AM

Quote:

Originally Posted by ChrisSlicks

From what I've seen and read about the engine design the oil is continuously passively cooled by the water coolant circulating in the engine block. There is nothing electronic that controls this, just the in-line oil temp gauge that seems to read moderately accurately. The added feature that was missing from the 350's is the new limp mode that tries to slow you down by limiting RPM when the oil temperature gets too high.

I'm not a mechanical engineer and so not an expert (just have an engineering background).

I know that the oil is cooled in that way and not 'electronically'. With respect, that has nothing to do with my question. I want to know if it's possible that an electrical component or thermostat is malfunctioning (possibly just by cutting in too soon, or reading a temp wrongly?) on some cars and the oil temp is in fact within limits, if a little on the high side. If this were the case, it would be a simple fix.

Also (and this is a bit of a side issue), how do you know that the oil temp guage is reading 'moderately accurately'? Without wishing to appear rude, isn't this an act of faith on your part, or do you have proof?

...ps Alan, I get some of my best thoughts in the shower - don't you?

ChrisSlicks · 04-02-2009, 11:50 AM

Quote:

Originally Posted by chubbs

I know that the oil is cooled in that way and not 'electronically'. With respect, that has nothing to do with my question. I want to know if it's possible that an electrical component or thermostat is malfunctioning (possibly just by cutting in too soon, or reading a temp wrongly?) on some cars and the oil temp is in fact within limits, if a little on the high side. If this were the case, it would be a simple fix.

The data indicates that the first inital cut in RPM takes place at 280F degrees, and the second cut at 300F degrees (approx as the computer is acting on voltage not degrees). So yes you could theoretically disable this feature but I'm not sure if that would be a good thing.

Quote:

Originally Posted by chubbs

Also (and this is a bit of a side issue), how do you know that the oil temp guage is reading 'moderately accurately'? Without wishing to appear rude, isn't this an act of faith on your part, or do you have proof?

I forgot where I saw it, might have been one of the Japanese forums (ask your buddies over there if they know) but someone did replace the sender and gauge with a racing unit as a test and the readings were quite close. It wasn't tested side by side but was under similar conditions. My ability to read Japanese is limited to what the translator spits out so I may have misinterpreted the information.

chubbs · 04-02-2009, 11:58 AM

Quote:

Originally Posted by ChrisSlicks

So yes you could theoretically disable this feature but I'm not sure if that would be a good thing.

I forgot where I saw it, might have been one of the Japanese forums (ask your buddies over there if they know) but someone did replace the sender and gauge with a racing unit as a test and the readings were quite close. It wasn't tested side by side but was under similar conditions. My ability to read Japanese is limited to what the translator spits out so I may have misinterpreted the information.

Thanks for that Chris - I agree it would be a bad idea to disable a safety feature.

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